Andrew Zonenberg2d ago
Firestopping on cable tray penetrations between my lab and house (cc: @whitequark )
Show threadLambda2d ago
@azonenberg @whitequark huh, you just stuff those pillows in there and caulk up the gaps? I don't think that's allowed here - at least I've never seen it for residential/normal business buildings, it's always fully filled up with white firestop compound.
Show threadZOP
@lambda @azonenberg @whitequark If they’re actually fire stop pillows they’ll char and expand when exposed to flame. Sealing up tight. Until they’re exposed to fire though, they can’t be relied upon to keep smoke from propagating between spaces.
Apr 12 at 3:26pmWeb
Show threadAndrew Zonenberg2d ago
@zop @lambda @whitequark yeah the caulk and mineral wool in the bottom area helps make it more airtight while still having pillow to pillow joints you can easily remove to add wires
Show threadZOP2d ago
@azonenberg @lambda @whitequark Exactly. I’ve used them a lot in cable trays or larger openings any time there was a chance we’d be in and out of them in the future, or just when there was larger gaps I didn’t want to make sheet metal filler plates for. Do it decent it’ll pass fire inspection anger…except Chicago lol (Chicago made me build sheet metal AND pack pillows AND caulk to make one inspector happy)
Show threadAndrew Zonenberg2d ago
@zop @lambda @whitequark oh this wouldn't pass in Chicago their codes are crazy I'd have to run all of my wiring in EMT instead of using MC